Answer:
The siege of Petersburg was the event that led to the capture of Richmond, the Confederate capital. The last option among all the given options is the correct option. As soon as Richmond, Virginia fell in the hands of the Union, it signaled that the war was nearing its end. General Ulysses S. Grant tried unsuccessfully to capture the town for 10 months and ultimately he was successful. This was a major event of the Civil War. Many soldiers from both sides died. Lee had to leave the city and move back with his remaining soldiers and it signaled a big win for the Union army.